Highly porous refractory bricks are
Less susceptible to chemical attack by molten fluxes and gases etc
Very strong
Having very high thermal conductivity
None of these
Correct Answer :
D. None of these
Related Questions
Major component of flint glass is
Lead oxide
Silica
Alumina
Soda
Thorium is mainly used
For the manufacture of gas mantles
As a fissile fuel in a nuclear reactor
In the manufacture of hydrogen bomb
In the treatment of cancer
Parathion and Malathion are
Pesticides
Plasticisers for unsaturated polyesters
Pain-relieving drugs (analgesic)
Tranquilisers
What products do we get on electrolysis of saturated brine using steel cathode and graphite anode in an electrolytic cell?
Cl2 & Na
Cl2 & H2
O2 & H2
Cl2, H2 & NaOH solution
Chemical formula of BHC, which is an insecticide is
C6H6Cl6
C6Cl6
C6H5Cl
C6H4Cl2
Bromine content in sea water may be around __________ ppm.
70
640
1875
2500
Saponification value/number of an oil or fat is a measure of its
Fatty acid content
Degree of unsaturation of the fatty acids present in it
Average molecular weight
Insoluble fatty acid content
Phthalic anhydride is made by the
Oxidation of naphthalene
Oxidation of benzene
Dehydrogenation of ethyl benzene
None of these
Pick out the wrong statement.
Eosin requirement in tallow soap is about 40-50% which fastens the lather formation, softens the hard soaps and increases its cleansing action
Soap powder is prepared by mixing soap with hydrated sodium carbonate
Detergents differ from soaps in their action in hard water
Tarnish inhibitor (e.g., Benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc
Sodium salt of higher molecular weight fatty acid is termed as the __________ soap.
Hard
Soft
Metallic
Lubricating
Main product in calcium carbide-water reaction is
Ca(OH)2
C2H2
CO2
CaCO3
Dechlorination of treated water is necessary to
Remove residual turbidity
Reduce the bacterial load on filter
Control taste and odour
Remove chlorinous taste
High temperature carbonisation of coal takes place at __________ °C.
2000
700
1100
< 500
Ceramics are produced from silicates or clayish materials: Which of the following is not a ceramic material?
Slag cement
Glasses
Porcelain/Potteries
Teflon
Which of the following paper does not require a filler during manufacture?
Bond paper
Writing paper
Blotting paper
Coloured paper
A good quality coal should have
Low fusion point of ash
High ash content
High sulphur content
None of these
__________ are used as corrosion inhibitor for iron & steel in aqueous solutions.
Phosphates
Chromates
Sulphates
Bi-carbonates
The process involved in converting rubber into a thin sheet or coating it on fabric is called
Extrusion
Mastication
Calendaring
Vulcanisation
Which of the following is an ore of iron?
Galena
Chalcopyrite
Hematite
Bauxite
Which of the following is an organometallic compound?
Isopropyl alcohol
Tetra-ethyl lead
Zeolite
Cumene
Which of the following is not a pyrite ore?
Celestite
Galena
Gypsum
Siderite
The main use of HCl is in the
Drilling of petroleum wells and pickling of steel sheets
Manufacture of cationic detergent
Treatment of spent fuel of nuclear reactor
None of these
Zeolite is a/an
Naturally occuring clay which is capable of exchanging cations
Abrasive material
Catalyst used in shift conversion
None of these
Which of the following sugars is the sweetest?
Glucose
Fructose
Sucrose
Lactose
DDT should not be allowed to come in contact with iron (during its manufacture) to
Avoid its decomposition
Prevent sulphonation of the monochlorobenzene by the acid catalyst
Achieve non-hygroscopic property
None of these
High purity nitrogen is used in
Making protective gas (95% N2 + 5% H2) for annealing of cold rolled steel strip coils
Fire fighting purposes
Both (A) & (B)
Neither (A) nor (B)
Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving) characteristic of cement?
Xanthates
Stearic acid
Calcium & aluminium stearate
Formic acid
Glycerine can be obtained from
Fat
Naphthalene
Cumene
Sucrose
Sodium chloride content in sea water is about __________ gms/litre.
2
10
25
50
Average sulphur content in Indian pyrites is about __________ percent.
15
35
55
70